装饰材料价值较高，易损、易坏、易丢。因此应放入库内由专人保管，以防丢失。
参考答案：对
To be honest, if it were not for the fact that you ____ my close friend, I would not take such pains
to serve you. [ ]
A. were
B. are
C. had been
D. have been
